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14.7 pounds per square inch for each 33 ft of sea water that is in the water column. let me do some calcs. approx 5336 pounds per square inch on the watch at 12,000. Rolex has a marghin of safety built in that is almost one third more so firgure 18,000 ft waterproof. Flesh being composed of 96 or 98% water is incompressible in a water environment. Our air cavities of course crush easily.
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